Laser irradiation leads to formation of more stable and less acid soluble compounds, reducing susceptibility to acid dissolution. This statement is:

• A. False
• B. Not proven
• C. True
• D. Not applicable

Answer: (C)

Laser treatment can modify enamel to form a surface with more stable, less acid-soluble minerals, which makes it more resistant to acid attack. The heat and dehydration from laser exposure can promote recrystallization of the enamel minerals, increasing crystallinity and often reducing carbonate content, resulting in a surface layer that dissolves less readily in acid. That’s why the statement is true. Keep in mind that the degree of effect depends on the laser type, energy, and enamel condition; improper settings can cause surface damage, but the fundamental idea—that laser-induced changes can produce a more acid-resistant, stable enamel layer—holds.